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Slow XenServer SAN performance when multipathing is enabled

I had a customer that was experiencing very poor SAN performance problems. After several calls with Citrix we were finally informed that XenServer does not support going over 8 paths, and we were set for 16. I haven't found any official documentation regarding this and Citrix didn't reference anything official either, however reducing the paths to 8 completely resolved the issue. Hopefully this will help someone else that is experiencing the same issue.